Search for dissertations about: "Impedance Tomography"

Showing result 1 - 5 of 15 swedish dissertations containing the words Impedance Tomography.

  2. 1. Pulmonary ventilation and perfusion assessed by electrical impedance tomography - Experimental studies in pigs

    Author : Anneli Fagerberg; Göteborgs universitet; []
    Keywords : electrical impedance tomography; V Q matching; pig; endotoxinaemic ALI; ACE inhibitor;

    Abstract : Pulmonary ventilation and perfusion and ventilation/perfusion (V/Q) matching determine gas exchange in every lung unit in the healthy state and in the pathologically altered lung. Mismatch of V and Q lead to hypoxaemia and hypercapnia and monitoring of V/Q relations are thus important in critical illness. READ MORE

  4. 2. Airway mechanics of mice and men

    Author : Lennart Lundblad; Malmö Klinisk fysiologi och nuklearmedicin; []
    Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Fysiologi; radiologi; tomografi; tomography; medical instrumentation; Clinical physics; Medicin människa och djur ; Medicine human and vertebrates ; Penh; emphysema; airway resistance; gas conditioning; plethysmography; lung mechanics; Boyle s law; Physiology; medicinsk instrumentering; Klinisk fysiologi; radiology; enhanced pause; pulmonary fibrosis; micro computed tomography; forced oscillation technique; COPD;

    Abstract : In this thesis we explore and further develop several techniques used in the animal laboratory as well as in the clinical setting. In particular, we expand the understanding and usefulness of plethysmographic techniques in small rodents. READ MORE

  5. 3. Monitoring alveolar recruitment in the critically ill - Patient studies using electric impedance tomography and volume-dependent compliance

    Author : Karin Lowhagen; Göteborgs universitet; []
    Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; ALI; ARDS; compliance; end-expiratory lung volume; EELV; EIT; electric impedance tomography; lung recruitment; morbid obesity; PEEP; recruitment manoeuvre; regional ventilation; volume-dependent compliance;

    Abstract : Background: Acute lung injury (ALI) and acute respiratory distress syndrome (ARDS) are associated with a high mortality rate and poor long term outcome in terms of quality of life, for those who survive. Similarly, patients with morbid obesity are at risk for respiratory complications when subjected to anaesthesia and surgery. READ MORE

  6. 4. Pontryagin approximations for optimal design

    Author : Jesper Carlsson; Anders Szepessy; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Topology Optimization; Inverse Problems; Hamilton-Jacobi; Regularization; Error Estimates; Impedance Tomography; Numerical analysis; Numerisk analys;

    Abstract : This thesis concerns the approximation of optimally controlled partial differential equations for applications in optimal design and reconstruction. Such optimal control problems are often ill-posed and need to be regularized to obtain good approximations. READ MORE

  7. 5. Sensitivity Analysis and Material Parameter Estimation using Electromagnetic Modelling

    Author : Therese Sjödén; Sven Nordebo; Börje Nilsson; Margaret Cheney; Linnéuniversitetet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; sensitivity analysis; material parameter; Fisher information; Cramér-Rao bound; electromagnetic modelling; grain angle; wood; electrical impedance tomography; inverse problems; känslighetsanalys; estimering; materialparameter; Fisher- information; Cramér-Rao-gränsen; elektromagnetisk modellering; fibervinkel; trä; elektrisk impedanstomografi; inversa problem; Waves; Signals and Systems; Vågor; signaler och system;

    Abstract : Estimating parameters is the problem of finding their values from measurements and modelling. Parameters describe properties of a system; material, for instance, are defined by mechanical, electrical, and chemical parameters. Fisher information is an information measure, giving information about how changes in the parameter effect the estimation. READ MORE